Leakage protection method, device and system and charging pile

Abstract

The invention discloses a leakage protection method, device and system and a charging pile, and the method comprises the steps: obtaining system power distribution parameters; acquiring an electric leakage value and an electric leakage detection signal when the system power distribution parameter meets an electric leakage acquisition condition; obtaining a load type according to the system power distribution parameters; performing electric leakage analysis according to the electric leakage value, the electric leakage detection signal and the load type to obtain an electric leakage result; and executing an electric leakage protection action corresponding to the electric leakage result, thereby further performing deep analysis in combination with the load type and the electric leakage detection signal, and executing different electric leakage protection actions according to different electric leakage results through a plurality of levels of electric leakage judgment processes, thereby improving the reliability of electric leakage protection and improving the reliability of electric leakage protection. And the judgment timeliness and precision of electric leakage are also improved.

Description

Technical Field

[0001] The present invention relates to the field of leakage protection technology, and in particular to a leakage protection method, device, system and charging pile. Background Art

[0002] Electric vehicles are increasingly popular and preferred. However, as the technical requirements for electric vehicle charging stations continue to rise, it's becoming increasingly common for leakage protection systems in these charging stations to be overly sensitive or inactive. For example, existing leakage detection systems rely on dedicated leakage sensors that trigger leakage detection upon detecting an abnormal electrical signal, resulting in a high rate of false alarms. Summary of the Invention

[0003] The embodiments of the present invention provide a leakage protection method, device, system and charging pile to solve the problem of high false alarm rate of leakage in the prior art.

[0004] A leakage protection method, comprising: Obtain system power distribution parameters; When the system power distribution parameters meet the leakage collection conditions, obtaining the leakage value and the leakage detection signal; Obtaining a load type according to the system power distribution parameters; Performing leakage analysis according to the leakage value, the leakage detection signal, and the load type to obtain a leakage result; Execute a leakage protection action corresponding to the leakage result.

[0005] Furthermore, the system power distribution parameters include system voltage and grounding signal; the leakage collection condition is that the system voltage is greater than a preset voltage and the grounding signal is normal.

[0006] Furthermore, obtaining the load type according to the system power distribution parameters includes: Obtaining a phase difference between a system voltage and a system current according to the system power distribution parameters; The load type is obtained according to the phase difference.

[0007] Furthermore, obtaining the load type according to the phase difference includes: If the phase difference is a positive value, the load type is an inductive load; If the phase difference is zero, the load type is a resistive load; If the phase difference is a negative value, the load type is a capacitive load.

[0008] Furthermore, performing leakage analysis based on the leakage value, the leakage detection signal, and the load type to obtain a leakage result includes: Determine a target leakage threshold, a leakage time threshold, and an insulation warning threshold according to the load type; When the leakage detection signal is a first-level signal and the first holding time during which the leakage value is greater than the target leakage threshold is less than the leakage time threshold, determine that the leakage result is a minor leakage; When the leakage detection signal is a second-level signal and the second holding time during which the leakage value is greater than the target leakage threshold is not less than the leakage time threshold, determine that the leakage structure is a serious leakage; When the leakage detection signal is a first-level signal and the third holding time during which the leakage value is greater than the insulation warning threshold is not less than the leakage time threshold, determine that the leakage result is an abnormal insulation performance.

[0009] Further, determining the target leakage threshold and the leakage time threshold according to the load type includes: If the load type is a resistive load, the target leakage threshold is a first leakage threshold and the leakage time threshold is a first time threshold; If the load type is an inductive load, the target leakage threshold is the first leakage threshold, the leakage time threshold is a second time threshold, and the second time threshold is greater than the first time threshold; If the load type is a capacitive load, the target leakage threshold is a second leakage threshold, the leakage time threshold is the first time threshold, and the second leakage threshold is greater than the first leakage threshold.

[0010] A control device for implementing the above leakage protection method.

[0011] A leakage protection system includes a leakage control unit, a power distribution parameter detection unit, and the above control device; The power distribution parameter detection unit is connected to the control device and is configured to collect system power distribution parameters and output the system power distribution parameters to the control device; The leakage control unit is connected to the control device and is configured to output the leakage value and the leakage detection signal to the control device under the control of the control device.

[0012] Further, the control device is configured to output a calibration signal to the leakage control unit; The leakage control unit is further configured to calibrate the leakage current transformer according to the calibration signal and obtain the leakage value through the calibrated leakage current transformer; The control device is further configured to perform digital filtering processing on the leakage value.

[0013] A charging pile includes the above leakage protection system.

[0014] Embodiments of the present invention provide a leakage protection method, device, system and charging pile. The system distribution parameters are acquired. When the system distribution parameters meet the leakage collection conditions, the leakage value and the leakage detection signal are acquired, so as to preliminarily screen out the leakage state. Then, according to the system distribution parameters, the load type is acquired. According to the leakage value, the leakage detection signal and the load type, leakage analysis is performed to obtain the leakage result, and the leakage protection action corresponding to the leakage result is executed. Thus, in-depth analysis is further carried out by combining the load type and the leakage detection signal. Therefore, through multiple levels of leakage judgment processes, different leakage protection actions are executed according to different leakage results, which not only improves the reliability of leakage protection, but also improves the judgment timeliness and accuracy of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 is a flowchart of a leakage protection method in an embodiment of the present invention; Figure 2 is another flowchart of a leakage protection method in an embodiment of the present invention; Figure 3 is another flowchart of a leakage protection method in an embodiment of the present invention; Figure 4 is another flowchart of a leakage protection method in an embodiment of the present invention; Figure 5 is another flowchart of a leakage protection method in an embodiment of the present invention; Figure 6 is a schematic diagram of a leakage protection system in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0018] It should be understood that the present invention can be implemented in different forms and should not be construed as limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0019] The purpose of the terms used herein is only to describe specific embodiments and is not a limitation of the present invention. As used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprising" and "including", when used in this specification, identify the presence of the stated features, integers, steps, operations, elements and components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and groups. As used herein, the term "and" includes any and all combinations of the related listed items.

[0020] To fully understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention may have other embodiments.

[0021] This embodiment provides a leakage protection method applied to a charging pile. Exemplarily, as Figure 6 shown, the charging pile includes a leakage protection system. Specifically, the leakage protection system includes a leakage control unit, a power distribution parameter detection unit, and a control device; the power distribution parameter detection unit is connected to the control device and is used to collect system power distribution parameters and output the system power distribution parameters to the control device; the leakage control unit is connected to the control device and is used to output a leakage value and a leakage detection signal to the control device under the control of the control device. The control device is used to implement the leakage protection method.

[0022] This embodiment provides a leakage protection method applied to the above control device. As Figure 1 shown, it includes: S101: Obtain system power distribution parameters.

[0023] S102: When the system power distribution parameters meet the leakage collection conditions, obtain the leakage value and the leakage detection signal.

[0024] S103: Obtain the load type according to the system power distribution parameters.

[0025] S104: Perform leakage analysis according to the leakage value, the leakage detection signal, and the load type to obtain a leakage result.

[0026] S105: Execute a leakage protection action corresponding to the leakage result.

[0027] Among them, the system power distribution parameters are the power distribution parameters of the leakage protection system. Optionally, the system power distribution parameters include system voltage, system current, and grounding signal. It can be understood that the grounding signal is a grounding continuity signal. The leakage acquisition condition is a custom - set condition for determining whether to collect leakage signals. The load type is the type of electrical load connected to the charging pile. Exemplarily, the load type includes resistive load, inductive load, and capacitive load. Exemplarily, the resistive load includes pure - resistance loads such as resistors and heaters. The inductive load includes compressors, relays, and inductive ballasts, etc. The capacitive load includes filter capacitors, power system compensation devices, etc. The leakage protection actions include leakage alarm, controlling the charging pile to stop charging and discharging, and warning of abnormal insulation performance of the charging and discharging environment, etc.

[0028] As an example, in step S101, the control device acquires the system power distribution parameters. The system power distribution parameters can be realized by a power distribution parameter detection unit. Exemplarily, the power distribution parameter detection unit includes a voltage - current measurement module and a grounding continuity detection module. The voltage - current measurement module is used to measure the system voltage and system current. The grounding continuity detection module is used to detect the grounding signal. It can be understood that the voltage - current measurement module and the grounding continuity detection module can be specifically realized by techniques well - known to those skilled in the art, and are not limited herein.

[0029] As an example, in step S102, when the system power distribution parameters meet the leakage acquisition condition, the leakage value and the leakage detection signal are acquired. In this example, when the control device determines that the system power distribution parameters meet the leakage acquisition condition, it controls the leakage control unit to detect the leakage value and the leakage detection signal. Exemplarily, the leakage control unit includes a calibration module, an IO detection module, and a communication module. The calibration module is used to calibrate the leakage current transformer. The communication module is used to acquire the current real - time leakage value of the leakage current transformer. The IO detection module is used to output the leakage detection signal. For example, it outputs a high - level signal when there is a leakage and a low - level signal when there is no leakage. That is to say, when the system power distribution parameters meet the leakage acquisition condition, the control device controls the leakage control unit to acquire the current real - time leakage value of the leakage current transformer, controls it to perform preliminary leakage detection, and sends the leakage value and the leakage detection signal to the control device. It can be understood that the preliminary leakage detection can be realized by the hardware circuit in the IO detection unit. It should be noted that the hardware circuit for the preliminary leakage detection can adopt techniques well - known in the art and is not limited herein.

[0030] As an example, in step S103, according to the system power distribution parameters, the load type is acquired. Exemplarily, the load type can be determined according to the system voltage and system current in the system power distribution parameters. In this example, since different load types will have different degrees of influence on the leakage value, the load type is acquired to improve the accuracy of subsequent leakage analysis.

[0031] As an example, in step S104, leakage analysis is performed based on the leakage value, the leakage detection signal, and the load type to obtain a leakage result. Exemplarily, according to the load type, the leakage judgment method under different load types is determined, and then, in combination with the leakage value and the leakage detection signal, the current severity of the leakage is judged. For example, according to different load types, different leakage judgment thresholds and leakage anomaly holding times are determined, so as to judge the severity of the leakage and whether there is a misjudgment in combination with the leakage judgment threshold and the leakage anomaly holding time.

[0032] As an example, in step S105, a leakage protection action corresponding to the leakage result is executed. Exemplarily, if the leakage result is not a minor leakage, an alarm is given without performing other actions. If the leakage result is a severe leakage, an alarm is given and the charging and discharging are stopped simultaneously. If the leakage result is an abnormal insulation performance, an early warning is given to remind the user of the abnormal insulation performance warning of the charging and discharging environment. Exemplarily, this alarm method can be used to give an alarm through an indicator light or an audio device.

[0033] In this embodiment, system power distribution parameters are obtained. When the system power distribution parameters meet the leakage collection conditions, the leakage value and the leakage detection signal are obtained, so as to preliminarily screen out the leakage state. Then, according to the system power distribution parameters, the load type is obtained. Based on the leakage value, the leakage detection signal, and the load type, leakage analysis is performed to obtain a leakage result, and a leakage protection action corresponding to the leakage result is executed. Thus, in-depth analysis is further carried out in combination with the load type and the leakage detection signal. Through multiple levels of leakage judgment processes, different leakage protection actions are executed according to different leakage results, which not only improves the reliability of the leakage protection, but also enhances the judgment timeliness and accuracy of the leakage.

[0034] In one embodiment, the system power distribution parameters include the system voltage and the grounding signal; the leakage collection condition is that the system voltage is greater than a preset voltage and the grounding signal is normal.

[0035] Among them, the preset voltage is a voltage set by the user. Preferably, the preset voltage is 85V.

[0036] Exemplarily, after the control device collects the system voltage through the power distribution parameter detection unit and makes a judgment, if the system voltage is less than or equal to 85V, it is judged that the system power supply is abnormal and no leakage judgment is performed; or, the connection state of the grounding system is detected by collecting through the power distribution parameter detection unit. If the grounding signal is abnormal, no leakage judgment is performed.

[0037] In this embodiment, by setting the leakage collection condition as that the system voltage is greater than the preset voltage and the grounding signal is normal, the leakage state can be preliminarily screened to judge whether it is a hardware failure or a power distribution system leakage.

[0038] In one embodiment, as Figure 2 shown, in step S103, according to the system power distribution parameters, the load type is obtained, including: S201: According to the system power distribution parameters, obtain the phase difference between the system voltage and the system current.

[0039] S202: According to the phase difference, obtain the load type.

[0040] As an example, in step S201, according to the system power distribution parameters, the phase difference between the system voltage and the system current is obtained. The control device calculates the phase difference between the system voltage and the system current based on the system voltage and the system current in the system power distribution parameters, and obtains the phase difference between the system voltage and the system current. Exemplarily, the phase difference between the system voltage and the system current can be obtained by the zero-crossing detection method or Fourier transform.

[0041] As an example, in step S202, according to the phase difference, the load type is obtained. In this embodiment, since different types of electrical loads will result in different phase differences between the system voltage and the system current, therefore, by obtaining the load type according to the phase difference, the accuracy of the load type can be ensured.

[0042] In this embodiment, according to the system power distribution parameters, the phase difference between the system voltage and the system current is obtained. S202: According to the phase difference, the load type is obtained, which can ensure the accuracy of the load type.

[0043] In one embodiment, as Figure 3 shown, in step S202, obtaining the load type according to the phase difference includes: S301: If the phase difference is positive, the load type is an inductive load.

[0044] S302: If the phase difference is zero, the load type is a resistive load.

[0045] S303: If the phase difference is negative, the load type is a capacitive load.

[0046] As an example, in step S301, if the phase difference is positive, the load type is an inductive load. When the load type is an inductive load, the phase of the system current lags behind the system voltage by 90 degrees. Therefore, the phase difference between the system voltage and the system current is positive.

[0047] As an example, in step S302, if the phase difference is zero, the load type is a resistive load. When the load type is a resistive load, the phase of the system current is equal to the system voltage. Therefore, the phase difference between the system voltage and the system current is zero.

[0048] As an example, in step S303, if the phase difference is negative, the load type is a capacitive load. When the load type is a capacitive load, the phase of the system current leads the system voltage by 90 degrees. Therefore, the phase difference between the system voltage and the system current is negative.

[0049] In this embodiment, if the phase difference is positive, the load type is an inductive load. If the phase difference is zero, the load type is a resistive load. If the phase difference is negative, the load type is a capacitive load to ensure the accuracy of the load type.

[0050] In one embodiment, as Figure 4 shown, according to the leakage value, the leakage detection signal, and the load type, leakage analysis is performed to obtain a leakage result, including: S401: Determine a target leakage threshold, a leakage time threshold, and an insulation warning threshold according to the load type.

[0051] S402: When the leakage detection signal is a first-level signal and the first holding time during which the leakage value is greater than the target leakage threshold is less than the leakage time threshold, determine that the leakage result is a minor leakage.

[0052] S403: When the leakage detection signal is a second-level signal and the second holding time during which the leakage value is greater than the target leakage threshold is not less than the leakage time threshold, determine that the leakage structure is a serious leakage.

[0053] S404: When the leakage detection signal is a first-level signal and the third holding time during which the leakage value is greater than the insulation warning threshold is not less than the leakage time threshold, determine that the leakage result is an abnormal insulation performance.

[0054] As an example, in step S401, according to the load type, determine a target leakage threshold, a leakage time threshold, and an insulation warning threshold. Different target leakage thresholds, leakage time thresholds, and insulation warning thresholds corresponding to different load types are preset.

[0055] As an example, in step S402, when the leakage detection signal is a first-level signal and the first holding time during which the leakage value is greater than the target leakage threshold is less than the leakage time threshold, determine that the leakage result is a minor leakage. The IO detection module initially detects no leakage and outputs a low-level signal. However, the leakage value is greater than the target leakage threshold, and the holding time during which the leakage value is greater than the target leakage threshold, that is, the first holding time, is less than the leakage time threshold, so it is determined that the leakage result is a minor leakage. The leakage detection signal is a low-level signal, and the first holding time during which the leakage value is greater than the target leakage threshold is less than 5 seconds, so it is determined that the leakage result is a minor leakage.

[0056] As an example, in step S403, when the leakage detection signal is a second-level signal, and the second holding time during which the leakage value is greater than the target leakage threshold is not less than the leakage time threshold, it is determined that the leakage structure is severe leakage. The IO detection module initially detects leakage and outputs a high-level signal. However, since the leakage value is greater than the target leakage threshold, and the holding time during which the leakage value is greater than the target leakage threshold, that is, the second holding time, is not less than the leakage time threshold, the leakage result is determined to be severe leakage. When the leakage detection signal is a high-level signal and the second holding time during which the leakage value is greater than the target leakage threshold is equal to or greater than 5 seconds, the leakage result is determined to be severe leakage.

[0057] As an example, in step S404, when the leakage detection signal is a first-level signal, and the third holding time during which the leakage value is greater than the insulation warning threshold is not less than the leakage time threshold, the leakage result is determined to be abnormal insulation performance. Exemplarily, the insulation warning threshold is 80% of the target leakage threshold. Exemplarily, when the IO detection module initially detects no leakage and outputs a low-level signal, if the real-time leakage value is greater than 80% of the target leakage threshold and the corresponding third duration is greater than the leakage time threshold, the control device determines that the leakage result is abnormal insulation performance to give an early warning and remind the user of the abnormal insulation performance warning in the charge and discharge environment.

[0058] In this embodiment, according to the load type, the target leakage threshold, the leakage time threshold, and the insulation warning threshold are determined. When the leakage detection signal is a first-level signal, and the first holding time during which the leakage value is greater than the target leakage threshold is less than the leakage time threshold, the leakage result is determined to be slight leakage. When the leakage detection signal is a second-level signal, and the second holding time during which the leakage value is greater than the target leakage threshold is not less than the leakage time threshold, the leakage structure is determined to be severe leakage. When the leakage detection signal is a first-level signal, and the third holding time during which the leakage value is greater than the insulation warning threshold is not less than the leakage time threshold, the leakage result is determined to be abnormal insulation performance. Through multiple levels of leakage judgment processes and different-dimensional leakage analysis using the target leakage threshold, the leakage time threshold, and the insulation warning threshold, not only the reliability of leakage protection is improved, but also the judgment timeliness and accuracy of leakage are enhanced.

[0059] In one embodiment, as Figure 5 shown, in step S401, according to the load type, determining the target leakage threshold and the leakage time threshold includes: S501: If the load type is a resistive load, the target leakage threshold is the first leakage threshold, and the leakage time threshold is the first time threshold.

[0060] S502: If the load type is an inductive load, the target leakage threshold is the first leakage threshold, and the leakage time threshold is the second time threshold, and the second time threshold is greater than the first time threshold.

[0061] S503: If the load type is a capacitive load, the target leakage threshold is the second leakage threshold, the leakage time threshold is the first time threshold, and the second leakage threshold is greater than the first leakage threshold.

[0062] As an example, the first leakage threshold is increased by 10% as the second leakage threshold. The first time threshold is 5 seconds. The second time threshold is 10 seconds.

[0063] In this embodiment, according to different load types, the target leakage threshold and the leakage time threshold are correspondingly adjusted to facilitate self-correction of the leakage value deviation caused by inductive loads and capacitive loads, thereby ensuring the accuracy of leakage judgment.

[0064] This embodiment provides a control device for implementing the above-mentioned leakage protection method.

[0065] This embodiment provides a leakage protection system, including a leakage control unit, a power distribution parameter detection unit, and the above-mentioned control device; the power distribution parameter detection unit is connected to the control device and is used to collect system power distribution parameters and output the system power distribution parameters to the control device; the leakage control unit is connected to the control device and is used to output a leakage value and a leakage detection signal to the control device under the control of the control device.

[0066] Further, the power distribution parameter detection unit includes a voltage and current measurement module and a ground continuity detection module. The voltage and current measurement module is used to measure the system voltage and the system current. The ground continuity detection module is used to detect the ground signal. It can be understood that the voltage and current measurement module and the ground continuity detection module can specifically be implemented by techniques well-known to those skilled in the art, and are not limited herein.

[0067] Further, the leakage control unit includes a calibration module, an IO detection module, and a communication module. The calibration module is used to calibrate the leakage current transformer. The communication module is used to obtain the current real-time leakage value of the leakage current transformer. The IO detection module is used to output a leakage detection signal.

[0068] Further, the control device is used to output a calibration signal to the leakage control unit; the leakage control unit is also used to calibrate the leakage current transformer according to the calibration signal, and obtain the leakage value through the calibrated leakage current transformer; the control device is also used to perform digital filtering processing on the leakage value. In this embodiment, through the calibration of the leakage current transformer and the digital filtering of the leakage value, the accuracy of leakage detection can be further ensured.

[0069] Further, the control device is also used to store the leakage data for facilitating the troubleshooting of leakage faults.

[0070] This embodiment provides a charging pile, including the above-mentioned leakage protection system.

[0071] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A leakage protection method, characterized in that, Including: Obtain system power distribution parameters; When the system power distribution parameters meet the leakage collection condition, obtain the leakage value and the leakage detection signal; Obtain the load type according to the system power distribution parameters; Perform leakage analysis according to the leakage value, the leakage detection signal and the load type, and obtain the leakage result; Execute the leakage protection action corresponding to the leakage result.

2. The leakage protection method according to claim 1, characterized in that, The system power distribution parameters include system voltage and grounding signal; the leakage collection condition is that the system voltage is greater than the preset voltage and the grounding signal is normal.

3. The leakage protection method according to claim 1, characterized in that, The obtaining the load type according to the system power distribution parameters includes: Obtain the phase difference between the system voltage and the system current according to the system power distribution parameters; Obtain the load type according to the phase difference.

4. The leakage protection method according to claim 3, characterized in that The obtaining the load type according to the phase difference includes: If the phase difference is positive, the load type is an inductive load; If the phase difference is zero, the load type is a resistive load; If the phase difference is negative, the load type is a capacitive load.

5. The leakage protection method according to claim 1, characterized in that The performing leakage analysis according to the leakage value, the leakage detection signal and the load type, and obtaining the leakage result includes: Determine the target leakage threshold, the leakage time threshold and the insulation warning threshold according to the load type; When the leakage detection signal is the first level signal and the first holding time that the leakage value is greater than the target leakage threshold is less than the leakage time threshold, determine that the leakage result is a minor leakage; When the leakage detection signal is the second level signal and the second holding time that the leakage value is greater than the target leakage threshold is not less than the leakage time threshold, determine that the leakage structure is a serious leakage; When the leakage detection signal is the first level signal and the third holding time that the leakage value is greater than the insulation warning threshold is not less than the leakage time threshold, determine that the leakage result is an abnormal insulation performance.

6. The leakage protection method according to claim 1, characterized in that, Determining the target leakage threshold and the leakage time threshold according to the load type includes: If the load type is a resistive load, the target leakage threshold is the first leakage threshold and the leakage time threshold is the first time threshold; If the load type is an inductive load, the target leakage threshold is the first leakage threshold and the leakage time threshold is the second time threshold, and the second time threshold is greater than the first time threshold; If the load type is a capacitive load, the target leakage threshold is the second leakage threshold and the leakage time threshold is the first time threshold, and the second leakage threshold is greater than the first leakage threshold.

7. A control device, characterized in that, For implementing the leakage protection method according to any one of claims 1 to 6.

8. A leakage protection system, characterized in that, Including a leakage control unit, a power distribution parameter detection unit and the control device according to claim 7; The power distribution parameter detection unit is connected to the control device and is used for collecting system power distribution parameters and outputting the system power distribution parameters to the control device; The leakage control unit is connected to the control device and is used for outputting the leakage value and the leakage detection signal to the control device under the control of the control device.

9. The leakage protection system according to claim 8, characterized in that, The control device is used for outputting a calibration signal to the leakage control unit; The leakage control unit is further configured to calibrate the leakage current transformer according to the calibration signal, and obtain the leakage value through the calibrated leakage current transformer; The control device is further configured to perform digital filtering processing on the leakage value.

10. A charging pile, characterized in that, Comprising the leakage protection system according to claim 8 or 9.

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